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Android has 2 mechanisms for getting the channel: in Java, there's
ChromeVersionConstants, which is generated at build-time using
chrome/VERSION and the $android_channel GN variable. In native, there's
channel_android.cc, which determines channel at run-time from the
package name. Replace the native side with a JNI call to get the Java
constant, to avoid requiring the package name.

WebView needs channel and version info as well as Chrome, so move that
info from ChromeVersionConstants into a new VersionConstants base class
in version_info/. WebView currently adds channel info to UMA data, and
plans to use channel and major version for downloading Finch seeds.

Move Android-specific parts of version_info/ into version_info/android/.

Remove remnants of the "work" channel, which were missed by commit
0d9dc4f2.

BUG=733857

Change-Id: I61c952862e907ae666f910f4d386e712f6a52f2e
Reviewed-on: https://chromium-review.googlesource.com/927212
Commit-Queue: Paul Miller <paulmiller@chromium.org>
Reviewed-by: Richard Coles <torne@chromium.org>
Reviewed-by: Nico Weber <thakis@chromium.org>
Cr-Commit-Position: refs/heads/master@{#540003}